Description from Flora of China
Jasminum primulinum Hemsley.
Subshrubs erect, evergreen, 0.5-5 m. Branchlets 4-angled, glabrous. Leaves opposite, 3-foliolate or simple at base of branchlets; petiole 0.5-1.5 cm; leaf blade broadly ovate or elliptic, sometimes suborbicular, 3-5 × 1.5-2.5 cm, along with leaflet blade subleathery, glabrescent, veins obscure; leaflet blade narrowly ovate or ovate-lanceolate to narrowly elliptic, base cuneate, apex blunt and mucronulate, terminal one 2.5-6.5 × 0.5-2.2 cm, basally decurrent into a short petiolule, lateral ones sessile, 1.5-4 × 0.6-2 cm. Flowers usually solitary, axillary or rarely terminal; bracts leafy, obovate or lanceolate, 5-10 mm. Pedicel 3-8 mm. Calyx campanulate; lobes 5-8, leafy, lanceolate, 4-7 mm. Corolla yellow, funnelform, 2-4.5 cm in diam.; tube 1-1.5 cm; lobes 6-8, doubled in cultivation, broadly obovate or oblong, 1.1-1.8 cm. Berry ellipsoid, 6-8 mm in diam. Fl. Nov-Aug, fr. Mar-May. 2n = 24, 26*.
* Ravines, woods; 500-2600 m. Guizhou, SW Sichuan, Yunnan.